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[AussieGuy]

If I enter (on my ClassPad 330):

Define a(x)=diff(x^2,x)

and then try

a(1)

I get a "Wrong Argument Type" error. What's going on here? How do I define a function using the derivative of another function? There must be something incredibly straightforward and simple which I'm missing here, but I don't know what it is.

Thanks!

[AussieGuy]

I've solved it!

Define a(x) = diff(y^2,y,1,x)

does the trick